Process of centrifugally molding metals



Nov. 29, 1927. 1,650,987

J. HOLTHAUS- PROCESS OF CENTRIFUGALLY MOLDING METALS Fil'ed Aug. 18, 1925 I 171': J0 amp/Za/f/xZiUS. e M

UNITED STATES PATENT OFFICE.

J'OHANN HOLTHAUS, OI GELSENKIRCHEN, GERMANY.

' Application filed August 18,

PROCESS OF GENTRIFUGALLY MOLDING METALS.

In the process of centrifugally casting tubes and other hollow bodies,

where the liquid metal is fed through a spout into the rotating mold, a withdrawn from moved the spout being gradually the mold, or the latter bein longitudinally relatively to the fixe spout, the stream of metal discharged from the spout is coiled on 1d, and the usual methodis to prothe mo the inner surface of duce at first the thicker or butt end of the hollow body, in the case of producing tubes,

the socket end, then the cylindrical part, and

finally the cas shrinkage, for which quickly in the mold, it is like so the spigot or cylindrical end. In e of metals with high coetlicients of example steel, and metals harden after the casting, or found, that tubes and the liable to crack transversely,

cast are sometimes so seriously as to break apart.

This is iarged or butt largely end of the hollow body cannot yield sufficiently to counteract the deleterious eilects of shrinkage.

According to this invention this defect is over ferred to are used, by drical or spigot end,

smooth come, when metals of the kind refirst casting the cylinthen the intermediate or cylindrical part, and then the enlarged or socket end. With this method the portions first cast are able freely to yield in the longitudinal direct-ion While end :is

the butt still in the transition stage between the liquid and solid states, and risk of cracking is thus eliminated or at least greatly reduced.

I am aware that it has been heretofore proposed manner that the long pipe is and th to centritugally mold pipes in such central portion of the first molded and then the spigot end e socket end are formed simultanedue to the fact that the en' 1925, Serial No. 50,960, and in Germany August 26, 1924.

ter of the mold, but in accordance with the present invention the same effect. is produced by means of a single spout so that complicated and expensive means for moving an charging the two casting spouts are entirelyeliminated.

In order that this invention may be more clearly understood and readily carried into efiect,'a suitable form of apparatus is illustrated on the accompanying drawing whereon a is a mold mounted on supporting wheels b and adapted to move during the casting operation in thedirection of the arrow B. The spout 0 extends through the end 6 of the mold and the metal is supplied to the spoutt'rom the ladle d. The drawing shows 'the position at the commencement of the casting operation, and as soon as the metal begins to flow into the mold the latter is moved in the direction so that the spigot end of the pipe is first formed and the socket 6 end is formed only at the endof the operation.

What I claim as my invention and desire to secure by Letters Patent of the United States is I 7 The process of centrifugally casting hollow bodies in a centrifugal casting machine with only one relatively displaceable spout which consists in first casting the spigot end, then the intermediate portion, and finally the socket end.

In witness whereof I have signed this specification.

DR. JOHANN HOLTHAUYS. 

